Systemctl kurz und knapp

systemd Crashkurs

• Schnelle Übersicht über die wichtigsten Befehle für Service-Management und Targets unter systemd.*

Listing aller Services

• systemctl --type=service

Logging eines Dienstes

• journalctl -u ssh

Logging eines Dienstes fortlaufend

• journalctl -f -u ssh

Eigenen Service Unit erstellen

Service Datei

• vi /etc/systemd/system/simple-http.service

[Unit]
Description=My Miscellaneous Service
After=network.target

[Service]
Type=simple
User=xinux
WorkingDirectory=/home/xinux/share
ExecStart=/bin/python3 -m http.server
Restart=on-abort

[Install]
WantedBy=multi-user.target

Aktivieren

• systemctl daemon-reload
• systemctl enable simple-http.service
• systemctl start simple-http.service

Logs lesen

• journalctl -fu simple-http

Starten eines Service

• systemctl start simple-http

Stoppen eines Service

• systemctl stop simple-http

Restarten eines Service

• systemctl restart simple-http

Aktivieren eines Service

• systemctl enable simple-http

Deaktivieren eines Service

• systemctl disable simple-http

Status eines Service

• systemctl status simple-http

Set Default Target

• systemctl set-default multi-user.target
• systemctl set-default graphical.target

Get Default Target

• systemctl get-default

Changing Target

• systemctl isolate multi-user.target

Show Targets

• systemctl list-units --type target

UNIT                        LOAD   ACTIVE SUB    DESCRIPTION
basic.target                loaded active active Basic System
bluetooth.target            loaded active active Bluetooth
ceph-mds.target             loaded active active ceph target allowing to start/stop all ceph-mds@.service instances at once
ceph-mon.target             loaded active active ceph target allowing to start/stop all ceph-mon@.service instances at once
...